PROXIMITY SENSOR - TBD
PROXIMITY SENSOR - TBD
(OP)
WOULD LIKE TO USE a TBD ? device AS A PROXIMITY SENSOR TO DETECT MIRROR DOOR POSITIONS, "OPEN" OR "CLOSED" .
,AT CLOSE POSITION THE MIRROR IS ABOUT 15 TO 25 [CM] =[ 6 " TO 10"] FAR FROM THE TBD [RECEIVER AND TRANSMITTER.... [opto magnetic other not mechanical bar can be used] ?],
MIRROR DOOR MOVES TO OPEN POSITION ABOUT 45 DEGREES .
Question : What device (PROXIMITY SENSOR) TBD can DETECT DOOR distance +/- 0.5 [cm]or better from device [POSITIONS-open or close] ?
Note: device size shall be within 10 mm x 5 mm x 5 mm and not use the 930 nm light frequency.
,AT CLOSE POSITION THE MIRROR IS ABOUT 15 TO 25 [CM] =[ 6 " TO 10"] FAR FROM THE TBD [RECEIVER AND TRANSMITTER.... [opto magnetic other not mechanical bar can be used] ?],
MIRROR DOOR MOVES TO OPEN POSITION ABOUT 45 DEGREES .
Question : What device (PROXIMITY SENSOR) TBD can DETECT DOOR distance +/- 0.5 [cm]or better from device [POSITIONS-open or close] ?
Note: device size shall be within 10 mm x 5 mm x 5 mm and not use the 930 nm light frequency.





RE: PROXIMITY SENSOR - TBD
RE: PROXIMITY SENSOR - TBD
Having resorted to just about any contactless technique, from reed element+magnet to nozzle with air stream in environments where high radiation killed organic insulation materials and darkened optical glass, it has often been worth-while to examine the reasons for the contactless part of the specification and what the alternatives are.
Has that been done? Or did the specifier (without thinking) imagine an arrangement that she/he thought would work and put down words that described her/his conception of a viable arrangement?
Asking such questions often leads to a simple, reliable and low-cost solution.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: PROXIMITY SENSOR - TBD
Walt
RE: PROXIMITY SENSOR - TBD
Dan - Owner
http://www.Hi-TecDesigns.com
RE: PROXIMITY SENSOR - TBD
1-The Ultrasonic is big size if my understanding is right, please see sizes needed at my question, Thanks VE1BLL
2-The issue was not solved yet=TBD it is on a military project that is using a 3D 930nm optics. thanks Skogs....
3-Seems to me to use a receiver=RCV transmitter=Tx mechanical way, but than may have an issue with adjustments of TX & RCV [ yes STRONG !!!]
Was thinking will not have to invent the wheel ....... thanks for the answers
RE: PROXIMITY SENSOR - TBD
TTFN (ta ta for now)
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RE: PROXIMITY SENSOR - TBD
It'd be best to have a microcontroller monitor the whole thing including motor current and timings. Then report CBIT results for any excursions from normal.
Some systems might even include an absolute encoder to track the cover motion from end-to-end, and self-calibrate (learn) based on hard stops. Current spikes and lack of motion indicates the end stops. Next time approach the end stops more carefully.
In the old days, they'd used plain old mechanical microswitches with the usual reversing diodes. But these days they'd want something with "unlimited life" based on naive assumptions.
If it's a cover, such that the primary system is not used when the door is closed (or on the move), then perhaps you even could reuse the same wavelength by locking out one or the other. Maybe, maybe not - depending on the details.